| Table of Contents | |
| Section | Page |
| Start of eBook | 1 |
| OF | 1 |
| INVENTION AND DISCOVERY. | 12 |
| LETTERS FROM OUR YOUNG FRIENDS. | 12 |
| DEAR HOWARD: | 13 |
| ARITHMETICS | 14 |
| 17 | |
| 17 | |
| 18 | |
| Table of Contents | |
| Section | Page |
| Start of eBook | 1 |
| OF | 1 |
| INVENTION AND DISCOVERY. | 12 |
| LETTERS FROM OUR YOUNG FRIENDS. | 12 |
| DEAR HOWARD: | 13 |
| ARITHMETICS | 14 |
| 17 | |
| 17 | |
| 18 | |